What Is Beta Glucan? Moisture from Oats and Mushrooms
Other names: Beta-Glucan, Betaglucan, Oat Beta Glucan
Beta glucan is a water-binding polysaccharide found in oats, barley, yeast and mushrooms. In skin care it is used to form a film on the surface to reduce water loss and to calm reddened skin. In small studies, moisture and barrier measurements improved; however, a direct human study showing it is superior to hyaluronic acid is not known.
At a glance
- INCI name
- Beta-Glucan
- Type
- Polysaccharide, water-retaining film former
- Source
- Oat, barley, yeast, mushroom; their bond structures differ from one another
- Concentrations studied
- 0,25-1,5% in creams and serums
- What it does
- Moisture, reduced water loss, soothing support for reddened skin
- Concept often confused
- Hyaluronic acid; superiority not directly shown
What's on this page?
Beta glucan is not a single molecule but a family of polysaccharides made of glucose chains. Two products with the same name can differ in content depending on how the chains are bonded and on their source. Once applied, it is generally expected to stay on the skin surface and form a film that holds water. Its connection with immune cells is the part that sets it apart from an ordinary humectant, but this is not yet fully understood.
Oat or mushroom? Types of beta glucan
| Source | Chain structure | What has it been studied most for in skin? |
|---|---|---|
| Oat, barley | Unbranched, mixed 1,3 and 1,4 bonds | Fine lines, moisture, soothing |
| Yeast | 1,3 backbone and 1,6 side branches | Wound care, atopic dermatitis, moisture |
| Mushroom (for example shiitake) | 1,3 backbone, shorter 1,6 side branches | Mostly cell and animal models, UV damage |
You cannot always see this distinction on the label. On most products the INCI name is just Beta-Glucan, and you may need to learn the source from the product description. Water-soluble forms are easier to use in cosmetics; for insoluble forms there are more questions about immune response.
How does beta glucan moisturise and soothe the skin?
The moisture side is simpler: its helical structure and many polar groups form hydrogen bonds with water, creating a film that limits water loss on the surface. In this respect it acts like a humectant and a film former.
The soothing side comes more from the laboratory. In cell and 3D reconstructed skin models, carboxymethyl beta glucan was shown to activate the Dectin-1 receptor and reduce inflammatory signals such as IL-1β. The authors of a recent review summarising the topic also acknowledge that the mechanism is not fully understood and that the studies contradict one another. It should also be noted that the authors of that review have ties to a company.
What do small studies show?
| Situation | Study | Result | Its limit |
|---|---|---|---|
| Fine lines | 27 people, 8 weeks, oat | Reduction in wrinkle depth and roughness measurements | Authors from raw material companies |
| Atopic dermatitis | Open-label, beginning 105, ending 80, 0,25% cream | Itching and severity scores fell | Uncontrolled |
| After laser | 20 people, half face | Moisture higher and water loss lower on days 7 and 14 | Short duration, small group |
| Actinic keratosis | 20-person pilot, placebo-controlled | Improvement in both arms, no difference between them | No direct effect shown |
The most frequently repeated claim beside the oat study is that beta glucan, despite being such a large molecule, reaches the dermis. This claim comes from a measurement by the same team on frozen human skin with a single application; no independent confirmation is seen. There is also a placebo-controlled study on diabetic foot ulcers showing healing of 44% versus 17% at week 8, but that was a medical product and should not define expectations for a cosmetic cream.
Is it better than hyaluronic acid?
No reliable data shows this. The sentence "20% more moisturising than hyaluronic acid" circulates in brand texts, but there is no peer-reviewed comparison behind it. The side-by-side figures on supplier sites cannot be linked to any published study either. Moreover, direct moisture measurement data are clearly more abundant for hyaluronic acid.
Seeing these two as rivals is not necessary either. Both are large water-binding molecules, and there are formulas that combine the two ingredients, but the superiority of the combination has not been confirmed clinically either. For dry or redness-prone skin, beta glucan may be a reasonable choice; if your hyaluronic acid product does not bother you, there is no strong reason to change it.
What should you pay attention to when using it?
- Placement: There is no fixed protocol. Apply it as a serum or cream to clean skin; add a moisturiser on top in dry air.
- Expectation: The moisture sensation may come quickly. For fine lines, wait at least 6 weeks.
- Eczema: May support mild dryness, but if eczema flares, do not use the cream as a substitute for treatment; see a doctor.
- Wounds: Do not apply a cosmetic product to an open wound or to skin after a procedure without asking your doctor.
- Allergy: Studies report good tolerance, but they are small. If you are allergic to oat or yeast, find out the source of the product; test the new product on the inner arm or elbow crease, twice a day, for 7-10 days.
- Regulation: There is no separate record for beta glucan in the EU cosmetics regulation's restricted substances annexes. If you are curious about the traditional use of oats, you can look at the colloidal oatmeal page.
This page is for general information only and does not replace medical diagnosis or treatment. If you have an ongoing skin or scalp problem, consult a dermatologist.